[GHC] #9814: Add Data.Void to base

[GHC]

#9814: Add Data.Void to base
-------------------------------------+-------------------------------------
              Reporter:  shachaf     |            Owner:  hvr
                  Type:  feature     |           Status:  patch
  request                            |        Milestone:  7.10.1
              Priority:  normal      |          Version:
             Component:  Core        |         Keywords:
  Libraries                          |     Architecture:  Unknown/Multiple
            Resolution:              |       Difficulty:  Unknown
      Operating System:              |       Blocked By:
  Unknown/Multiple                   |  Related Tickets:
       Type of failure:              |
  None/Unknown                       |
             Test Case:              |
              Blocking:              |
Differential Revisions:  Phab:D506   |
-------------------------------------+-------------------------------------

Comment (by Herbert Valerio Riedel <hvr@…>):

 In [changeset:"a97f90cecb6351a6db5a62c1551fcbf079b0acdd/ghc"]:
 {{{
 #!CommitTicketReference repository="ghc"
 revision="a97f90cecb6351a6db5a62c1551fcbf079b0acdd"
 Add Data.Void to base (re #9814)

 This adds the module `Data.Void` (formerly provided by Edward Kmett's
 `void`
 package) to `base`.

 The original Haskell98 compatible implementation has been modified to use
 modern GHC features (among others this makes use of `EmptyCase` as
 motivated by #2431), and `vacuousM` was dropped since it's redundant now
 with the AMP in place.  Instances for classes not part of `base` had to be
 dropped as well.

 TODO: Documentation could be improved

 Reviewed By: ekmett, austin

 Differential Revision: https://phabricator.haskell.org/D506
 }}}

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/9814#comment:3>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler